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l = 90/p
pt = 40
t = 40/p
sub. lt = 36
90/p x 40/p = 36
1/p^2 = 3600/36
p = 10
l = 90/10 = 9
t = 40/10 = 10
V = plt = 10 x 9 x 4 = 360 cm^3 (A)